One bladed prop!
Flew today at the Golden Age Air Museum in PA
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| Guaranteed neat-o https://www.warbirdinformationexchange.org/phpBB3/viewtopic.php?f=16&t=50007 |
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| Author: | Baldeagle [ Sat Jun 15, 2013 11:10 pm ] |
| Post subject: | Guaranteed neat-o |
One bladed prop! Flew today at the Golden Age Air Museum in PA - |
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| Author: | tom d. friedman [ Sat Jun 15, 2013 11:14 pm ] |
| Post subject: | Re: Guaranteed neat-o |
I don't understand the concept or what it's purpose is. definitely weird!! I would think an unbalanced prop would cause bad torque. |
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| Author: | bdk [ Sat Jun 15, 2013 11:37 pm ] |
| Post subject: | Re: Guaranteed neat-o |
Why do you say it is unbalanced? It has a metal weight on the side opposite the prop blade. |
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| Author: | Tiger Tim [ Sun Jun 16, 2013 12:27 am ] |
| Post subject: | Re: Guaranteed neat-o |
I'd love to fly behind an Everel prop sometime. Tom, not only are they counterweighted but they have an angled teetering hinge in the hub that allows the prop blade to move forward or back depending on the balance between air load and centrifugal force. Because the hinge is angled this change in tracking also changes pitch making it act a little like a constant speed prop. I believe a similar principle is used in the later, more conventional Aeromatic props. -Tim |
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| Author: | Obergrafeter [ Sun Jun 16, 2013 7:24 am ] |
| Post subject: | Re: Guaranteed neat-o |
tom d. friedman wrote: I don't understand the concept or what it's purpose is. definitely weird!! I would think an unbalanced prop would cause bad torque. It is always cutting "clean" air and is therefore more efficient (In theory anyway) |
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| Author: | JohnB [ Sun Jun 16, 2013 10:28 am ] |
| Post subject: | Re: Guaranteed neat-o |
I believe they tested one on an early Bonanza. The name Roby comes to mind as the prop maker, but I may be wrong about that. |
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| Author: | Baldeagle [ Sun Jun 16, 2013 10:46 am ] |
| Post subject: | Re: Guaranteed neat-o |
I wish I could've gotten some video, it was weird to see it wobble on its hub (when static and moved by hand), but I was really busy and just got a quick snapshot. There are supposed to be two J-2 Cubs with the Everal prop on them at the Lock Haven PA Sentimental Journey fly-in this week. I've heard that the concept was good, balance fine, but that it put a constant asymmetric load on the thrust bearings and wore them out. Seems like the teetering hub would help with that, but you're still only making thrust on one side. - |
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| Author: | Scott Rose [ Sun Jun 16, 2013 11:27 am ] |
| Post subject: | Re: Guaranteed neat-o |
I was a little skeptical at the "guarantee" of this being neat-o but dang if it isn't! |
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| Author: | DH82EH [ Sun Jun 16, 2013 6:11 pm ] |
| Post subject: | Re: Guaranteed neat-o |
Hey you gotta be impressed when Scott joins the party! This definitely qualifies as neat-o! Thanks for posting. I remember JDK posting about 1 bladed propellers Come back James!! Andy Scott |
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| Author: | Baldeagle [ Sun Jun 16, 2013 8:03 pm ] |
| Post subject: | Re: Guaranteed neat-o |
Hey, when I guarantee..... Found an old ad online:  From: http://pearsoncuratorscorner.blogspot.c ... -look.html - |
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| Author: | C VEICH [ Mon Jun 17, 2013 12:12 am ] |
| Post subject: | Re: Guaranteed neat-o |
I've heard it said, or seen it printed, numerous times that the biggest reason why single blade props did not catch on was simply one of appearance. Humans like symmetry! |
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